ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 125
ATmega406
Manufacturer Part Number
ATmega406
Description
Manufacturer
Atmel Corporation
Specifications of ATmega406
Flash (kbytes)
40 Kbytes
Pin Count
48
Max. Operating Frequency
1 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
18
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
12
Adc Speed (ksps)
1.9
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-30 to 85
I/o Supply Class
4.0 to 25
Operating Voltage (vcc)
4.0 to 25
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
3
Pwm Channels
2
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega406-1AAU
Manufacturer:
AT
Quantity:
20 000
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22. Battery Protection
22.1
Table 22-1.
2548E–AVR–07/06
Battery Protection Type
Deep Under-voltage
Detected
Discharge Over-current
Protection
Charge Over-current
Protection
Short-circuit Protection
Features
Effect of Battery Protection Types
•
•
•
•
•
•
If the voltage at the VFET pin falls below the programmable Deep Under-voltage detection level,
C-FET, PC-FET, and D-FET are disabled and the chip is set in Power-off mode to reduce power
consumption to a minimum.
The Current Battery Protection circuitry (CBP) monitors the charge and discharge current and
disables C-FET, PC-FET, and D-FET if an over-current or short-circuit condition is detected.
There are three different programmable detection levels: Discharge Over-current Detection
Level, Charge Over-current Detection Level and Short-circuit Detection Level. The external filter
at the PI/NI input pins will cause too large delay for short-circuit detection. Therefore the sepa-
rate PPI/NNI inputs are used for Current Battery Protection. There are two different
programmable delays for activating Current Battery Protection: Short-circuit Reaction Time and
Over-current Reaction Time. After Current Battery Protection has been activated, the application
software must re-enable the FETs. The Battery Protection hardware provides a hold-off time of 1
second before software can re-enable the discharge FET. This provides safety in case the appli-
cation software should unintentionally re-enable the discharge FET too early.
The activation of a protection also issues an interrupt to the CPU. The battery protection inter-
rupts can be individually enabled and disabled by the CPU.
The effect of the various battery protection types is given in
In order to reduce power consumption, both Short-circuit and Discharge Over-current Protection
are automatically deactivated when the D-FET is disabled. The Charge Over-current Protection
is disabled when both the C-FET and the PC-FET are disabled. Note however that Charge Over-
current Protection is never automatically disabled when any of the C-FET or PC-FETs are con-
trolled by PWM.
Interrupt Requests
CPU Reset on exit
Entry and exit
Entry and exit
Entry and exit
Deep Under-voltage Protection
Charge Over-current Protection
Discharge Over-current Protection
Short-circuit Protection
Programmable and Lockable Detection Levels and Reaction Times
Autonomous Operation Independent of CPU
C-FET
Disabled
Disabled
Disabled
Disabled
D-FET
Disabled
Disabled
Disabled
Disabled
PC-FET
Disabled
Disabled
Disabled
Disabled
Cell Balancing FETs
Disabled
Operational
Operational
Operational
Table
22-1.
ATmega406
MCU
Power-off
Operational
Operational
Operational
125
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